A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to 1.3 atm, and the temperature of the gas increases to 285 K. What is the final volume of the gas?

Use the combined gas law: P₁V₁/T₁ = P₂V₂/T₂. Solving for final volume gives V₂ = (P₁V₁T₂)/(T₁P₂) = (1.6 × 168 × 285)/(255 × 1.3) ≈ 231 cm³. The final volume is 231 cm³, choice C.

AI-written and checked against the verified answer.